12577661 has 4 divisors (see below), whose sum is σ = 12983424. Its totient is φ = 12171900.

The previous prime is 12577657. The next prime is 12577667. The reversal of 12577661 is 16677521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12577661 - 2² = 12577657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12577667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202835 + ... + 202896.

It is an arithmetic number, because the mean of its divisors is an integer number (3245856).

Almost surely, 2^12577661 is an apocalyptic number.

It is an amenable number.

12577661 is a deficient number, since it is larger than the sum of its proper divisors (405763).

12577661 is an equidigital number, since it uses as much as digits as its factorization.

12577661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405762.

The product of its digits is 17640, while the sum is 35.

The square root of 12577661 is about 3546.4998237699. The cubic root of 12577661 is about 232.5590769828.

The spelling of 12577661 in words is "twelve million, five hundred seventy-seven thousand, six hundred sixty-one".